This source says that Kilar had planned his post for awhile, and knew that it could result in him being ousted from Hulu.

This awareness that his tenure could be over bleeds through Kilar's post.

In it, Kilar wrote: "A number of you that are reading this might be thinking that we’d have to be crazy to think that our small team can actually re-invent television and compete effectively against a landscape of distribution giants like cable companies, satellite companies, and huge online companies.